TM 11-6625-2735-14-1
Section 5—475 Service
PERFORMANCE CHECK
IMPORTANT–PLEASE READ BEFORE USING THIS PROCEDURE
Introduction
The following procedure is intended to be used for
incoming inspection to determine the acceptability of
newly purchased or recently recalibrated instruments.
This procedure does not check every facet of the in-
strument’s calibration; rather it is concerned primarily
with those portions of the instrument that are essential to
measurement accuracy and correct operation. Removing
the instrument cabinet is not necessary to perform this
procedure. All checks are made from the front panel. This
procedure is also useful as an aid in troubleshooting and
preventive maintenance.
Using This Procedure
Outline. To aid in locating a step in the Performance
Check, an outline is given preceding the Performance
Check procedure.
Partial Procedures. A partial check of performance is
often desirable after replacing components or to verify
performance of a portion of the instrument between major
recalibration. To check only part of the instrument, set
the controls as given under the nearest preceding Control
Settings and use the Equipment Required list preceding
the desired portion of the procedure.
TEST EQUIPMENT REQUIRED
General
The following test equipment and accessories, or its
equivalent, is required for a complete performance check
of the 475. Specifications given for the test equipment are
the minimum necessary for accurate calibration.
Therefore, some of the specifications listed here may
differ from the actual performance capabilities of the test
equipment. All test equipment is assumed to be correctly
calibrated and operating within the listed specifications.
Detailed operating instructions for the test equipment are
not given in this procedure. Refer to the instruction
manual for the test equipment if more information is
needed. Minimum test equipment specifications must
include the use of any special required accessories (such
as the precision output cable included with the SG503).
Refer to Maintenance Allocation Chart in Appendix D of
this manual for approved test equipment.
Special Calibration Fixtures
Special Tektronix calibration fixtures are used only
where they facilitate checking instrument performance.
These special calibration fixtures are available from
Tektronix, Inc. Order by part number through your local
Tektronix Field Office or representative.
Performance Check Equipment Alternatives
All of the listed test equipment is required to completely
check this instrument. However, complete checking may
not always be necessary or desirable. The user may be
satisfied with checking only selected characteristics,
thereby reducing the amount of test equipment actually
required.
The equipment listed in the Performance Check
Procedure is based on the first item of equipment given as
an example of applicable equipment. When other equip-
ment is substituted, control settings or equipment setups
may need to be altered to meet the requirements of the
substitute equipment. If the exact item of test equipment
given as an example in the Test Equipment list is not
available, first check the Specifications column carefully
to see if any other equipment is available which might
suffice. Then check the Usage column to see what this
item is used for. If used for a check or adjustment that is of
little or no importance to your measurement re-
quirements, the item and corresponding step(s) can be
deleted.
5-1
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